Retaining means for rotary-drill cutters.



H. H. HUGHES.

RETAINING MEANS FOR ROTARY DRILL CUTTERS. APPLICATION FILED FEB. 24, 1914.

1,174,577- Patented Mar. 7,1916.

OWARD R. UG-HES, OF HOUSTON, TEXAS, ASSIG-NOR T SHARP-HUGHES TOOL COMPANY, OF HOUSTON',` TEXAS, A; CORPORATION OF TEXAS,

Application led February 24, 1914. Serial No. $20,678.

To all 'whom t may concern l l Be it known that l, HOWARD R. l-lueHns, a citizen-of the United States, residing at Houston, Texas, have invented a certain newand useful Improvement in Retaining Means for RotaryDrill Cutters, of which the following is a full, clear, and exact descriptlon,

same.

This invention relates to rotary boring drills of the type in which the cutters are J held in operative position on their spindles j by means of retaining rings on the cutters `15 that project under laterallyr projecting portions on the spindles, such, for example, as in the drill shown in my prior Patent No.

979,496, dated Dec. 27, 1910. In the drill shown in lthe patent above-referred tothe retaining ring' is screwed intothe cutter, and the head of the drill is provided with a hole through which a tool can be inserted so as to hold the retaining .ring at rest when the cutter is being screwed onto or oftl of same.

The object of my present invention is to l provide a cutter-retaining means of novel design which`can be manufactured cheaply,

' which enables the cutter to be applied and Yremoved quickly, and which overcomes the necessity of forming a hole in the head to receive a tool for holding the retaining ring at rest when the cutter is being attached to and the preferred Qrm of disconnected from same.

Figure-lis a side elevational view, partly broken away, of arotary boring drill whose -cutters are held in operative position by my improved cutter-retaining means; and Fig. 2 is a sectional .view taken on the line 2-2 of Fig. 1. l "j Referring 'to the drawings which illustrate my invention, A the drill, and B designates the `head of designates the approximately frustolconical- 'shaped cutters that are ,rotatably mounted on said'head .on spindles that are either formed 'integral with the head' or detachably connected to the head, and which are provided with shoulders or laterally projecting portions that lap over retaining rings C to which the cutters B are connected.

In the form of myinvention hereinillustrated the nhead` A' ofthe drill is `provided l Specification of Letters Patent.

ing'2 that has a reduced portion so as to form a shoulder 3 which laps over the retainlng ring C that is loosely-mounted on said reduced portion, but I do not wish it to be understood that my invention is limited to such a construction asmy present invention relates particularly to the means for conj necting the retaining ring C to its cutter.

Instead of screwing the retaining ring C 1nto an internally sore -threaded borein the base end of the cutter, as has heretofore been the general practice, the retaining rings of the drill hereinishown are merely seated loosely inA circular recesses formed in the base ends of the cutters, and each cutter is provided with a plurality'of radially-disposed, removable fastening devices, prefer-A ably hollow set screws 4, whose inner ends project into an annular groove 5 formed in the outerface of the retaining ring. The

`ings 6 for the retaining devices 4 which extend at lapproximately right angles to the spindle I, thereby effectively holding the cutter in operative position and preventing it from moving longitudinally of the spindle.

In a construction of the character vabovedescribed it is nnot necessary to form internal screw-threads on the walls of the recess,` or socket in the cutter which receives the retaining ring, it is not necessary to form a hole in the head of the drill to receive a tool or device for holdin/g the retaining ring at rest while the cutter is beingconnected to and disconnected from same; and another desirable feature of such a construction is L that the cutters can be applied and removed quickly by simply manipulating the fastening devices 4 thatproject into the annular groove in the retaining ring. Having thus described AI claim as 'new and desire ters Patent is: l 1. A rotary boringy drill comprising a head, a cutter, a spindle n which said cutter -is rotatably mounted, said spindle having a shoulder, a retaining ring arranged' loosely in a' recessin saidcutter and rotatably mounted on said spindle under said shoulder, and removable fastening devices on the cutter that project into an annular tosecure by Letmy invention, what l ,Y tudinally of thespindle. j

2.*In a rotary boring drill, an approxi- .j thus prevent thev cutter from moving longiwith integral spindles 1, each o fwhich is lequipped with a removable portion'or bush-VL' Q Y ritrae?? groove formed in said retaining ring so as to prevent the cutter from moving longitudinally of the spindle.

n testimony whereof I hereunto aix my signature in the presence of two Witnesses, 15k

this 13 day of February 1914.

HGWARD R. HUGHES. Witnesses:

HARRY B. HAGENAL, E. E. WRIGHT. 

